This picture shows an Aluminum Hub Clamp installed over an SF6 gas leak on a 345kV Breaker Bushing. The leak was located where the porcelain bushing goes through the flange. The custom fabricated COLT Power Services clamp has a rubber seal on the ID, which closes on the OD of the bushing. The clamp also has a rubber seal on the inside face. This seal is pulled up against the outside face of the existing bushing flange by using six of the existing flange bolts. This creates seals on each side of the leaking area (where the bushing goes through the flange) that encapsulate the leak. Colt’s S-22 sealant is hydraulically injected between the clamp seals for maximum penetration and compaction around the entire leaking area.